In a new boost for 3-D printing, NASA has successfully tested a rocket engine that was built using a 3-D printer injector component. During the test on Aug. 22, the engine delivered 20,000 pounds of thrust and the injector passed its test. NASA hopes that 3-D printing can melt the cost of some expensive rocket parts by one half.

The part used was an injector which passes liquid oxygen and hydrogen to the engine. NASA scientists designed the injector which was built by Directed Manufacturing in Austin, TX.

In addition to the rocket parts, NASA is also plans other uses for the 3D technology.

This hot-fire test is designed to test how components withstand temperatures up to 6,000 degrees Fahrenheit and extreme pressures.

Propulsion systems engineer Greg Barnett gets the 3-D rocket injector ready for a hot fire test at NASA's Marshall Space Flight Center in Huntsville, Ala. This particular 9.5-inch injector is about half the size of the one that's expected to be used in NASA's RS-25 engine. It was made with just two pieces whereas a similar injector made with traditional welding has 115 pieces.

(Image: NASA/MSFC/Emmett Given)

A 3-D printer created this one piece rocket-engine injector in 40 hours. It has previously months to make the same part by welding many pieces together. The left image shows the injector after it was removed from the melting printer and the right image shows the final version.

(Image: NASA/MSFC)

A computer file instructs the printer how use its laser to melt fine powder into its final shape. Of course, NASA wasn't satisfied with calling it 3-D printing so it's now additive manufacturing.

Credit: NASA

This paint brush shows the fine granules used in the process.

(Image: NASA)

NASA is developing a 3-D printing process to provide food for space travellers. It's similar to the replicators in Star Trek.

Technicians are preparing for the test fire.

This CT scan of the 3-D injector was performed to make sure that the part was up to standards.

(Image: NASA)

The rockets are ablaze during the test.

(Image: NASA)

NASA is hoping that 3-D printers will soon be available to print small tools that astronauts can use immediately rather than waiting for the next supply ship to deliver them. It's also expected to assist with repairs.